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Illinois

$89+ Cheap flights from South Dakota to Illinois

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
FSD — ORD
ago. 5 — ago. 121
mar. 8/5
mar. 8/12
1 adult, Economy
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Cheap flight deals from South Dakota to Illinois

Keep the following information in mind while searching for South Dakota to Illinois flight deals. Data was last updated julio 31, 2025.

Round-trip from

$189
(United Airlines)

One-way from

$89
(Frontier)

Popular in

March

Cheapest in

January

Average price

$300

Good round-trip deal

$334 or less

Good one-way deal

$154 or less
From South Dakota to Illinois
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One-way flight from South Dakota to Illinois
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Highest demand for flights based on searches. 10% potential increase in price ($33 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from South Dakota to Illinois.
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Price to beat on a one-way flight from South Dakota to Illinois.
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Find flight deals from South Dakota to Illinois

Cheapest flights from South Dakota to Illinois
Explore the most affordable flight options available from South Dakota to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 31, 2025.

This American Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/217:16 pmFSD - ORD
Nonstop1h 58mAmerican Airlines
mar. 11/258:29 amORD - FSD
Nonstop1h 58mAmerican Airlines
Deal found 7/31$189
This FlightHub deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/273:07 pmFSD - ORD
1 stop6h 35mFrontier
dom. 8/316:00 amORD - FSD
1 stop7h 23mFrontier
Deal found 7/28$195
This Mytrip deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/137:48 pmFSD - MDW
1 stop25h 06mFrontier
lun. 8/1812:35 pmMDW - FSD
1 stop6h 02mFrontier
Deal found 7/30$197
This American Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/26:12 pmRAP - ORD
Nonstop2h 18mAmerican Airlines
dom. 10/511:08 amORD - RAP
Nonstop2h 34mAmerican Airlines
Deal found 7/30$200
This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/3012:56 pmFSD - MDW
1 stop4h 41mDelta
sáb. 9/67:17 pmMDW - FSD
1 stop4h 29mDelta
Deal found 7/31$209
This Delta deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/205:00 amFSD - ORD
1 stop3h 24mDelta
sáb. 8/236:10 amORD - FSD
1 stop6h 06mDelta
Deal found 7/30$209
This United Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 8/156:26 pmFSD - ORD
Nonstop1h 50mUnited Airlines
mar. 8/198:20 pmORD - FSD
Nonstop1h 52mUnited Airlines
Deal found 7/31$217
This United Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/41:35 pmRAP - ORD
Nonstop2h 21mUnited Airlines
dom. 9/75:00 amORD - RAP
1 stop5h 06mUnited Airlines
Deal found 7/31$219
This Delta deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/285:00 amFSD - STL
1 stop3h 36mDelta
jue. 9/46:00 amSTL - FSD
1 stop6h 16mDelta
Deal found 7/30$229
This Mytrip deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/812:43 pmFSD - ORD
1 stop16h 06mMultiple Airlines
jue. 9/116:44 pmORD - FSD
2 stops24h 14mMultiple Airlines
Deal found 7/29$230
This American Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/146:03 pmFSD - STL
1 stop5h 48mAmerican Airlines
lun. 8/187:59 pmSTL - FSD
1 stop4h 29mAmerican Airlines
Deal found 7/30$239
This Delta deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/216:20 amRAP - STL
1 stop7h 10mDelta
lun. 8/257:03 pmSTL - RAP
1 stop4h 29mDelta
Deal found 7/30$249

Cheapflights Fare Finder

 
Customize your flight search to find flights from South Dakota to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated julio 31, 2025.
Use the filters below to find and compare flights from South Dakota to Illinois that are best for you.

Fly from

South Dakota

Fly to

Illinois

Route

Depart

Return

Price

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

vie. 11/21

7:16 pm-9:14 pm

Nonstop1h 58m

Chicago O'Hare Intl

mar. 11/25

8:29 am-10:27 am

Nonstop1h 58m

$189

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

mié. 8/27

3:07 pm-9:42 pm

1 stop6h 35m

Chicago O'Hare Intl

dom. 8/31

6:00 am-1:23 pm

1 stop7h 23m

$195

Sioux FallsChicago

FSD - MDW

FSDMDW

Sioux Falls Joe Foss Field

mié. 8/13

7:48 pm-8:54 pm

1 stop25h 06m

Chicago Midway

lun. 8/18

12:35 pm-6:37 pm

1 stop6h 02m

$197

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

jue. 10/2

6:12 pm-9:30 pm

Nonstop2h 18m

Chicago O'Hare Intl

dom. 10/5

11:08 am-12:42 pm

Nonstop2h 34m

$200

Sioux FallsChicago

FSD - MDW

FSDMDW

Sioux Falls Joe Foss Field

sáb. 8/30

12:56 pm-5:37 pm

1 stop4h 41m

Chicago Midway

sáb. 9/6

7:17 pm-11:46 pm

1 stop4h 29m

$209

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

mié. 8/20

5:00 am-8:24 am

1 stop3h 24m

Chicago O'Hare Intl

sáb. 8/23

6:10 am-12:16 pm

1 stop6h 06m

$209

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

vie. 8/15

6:26 pm-8:16 pm

Nonstop1h 50m

Chicago O'Hare Intl

mar. 8/19

8:20 pm-10:12 pm

Nonstop1h 52m

$217

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

jue. 9/4

1:35 pm-4:56 pm

Nonstop2h 21m

Chicago O'Hare Intl

dom. 9/7

5:00 am-9:06 am

1 stop5h 06m

$219

Sioux FallsSt. Louis

FSD - STL

FSDSTL

Sioux Falls Joe Foss Field

jue. 8/28

5:00 am-8:36 am

1 stop3h 36m

Lambert-St Louis

jue. 9/4

6:00 am-12:16 pm

1 stop6h 16m

$229

Sioux FallsChicago

FSD - ORD

FSDORD

Sioux Falls Joe Foss Field

lun. 9/8

12:43 pm-4:49 am

1 stop16h 06m

Chicago O'Hare Intl

jue. 9/11

6:44 pm-6:58 pm

2 stops24h 14m

$230

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 44 results
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Best time to book a flight from South Dakota to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from South Dakota with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from South Dakota to Illinois

What is the cheapest month to book a flight from South Dakota to Illinois?

Currently, August is the cheapest month in which you can book a flight from South Dakota to Illinois (average of $245). Flying from South Dakota to Illinois in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SD to IL?

Find hourly flight availability from South Dakota to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated julio 31, 2025.

When flying from South Dakota to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from South Dakota to Illinois

Explore weekly flight availability from South Dakota to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated julio 31, 2025.

The most flights from USSD to USIL are scheduled on a Thursday (19 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (8 on average).

How much does it cost to fly round-trip from South Dakota to Illinois?

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated julio 31, 2025.
Read through reviews of airlines operating flights from South Dakota to Illinois, such as Delta, United Airlines, and American Airlines. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,981 reviews
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,900 reviews
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Allegiant Air
7.2
Good
702 reviews
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Frontier
5.9
Fair
3,239 reviews
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from South Dakota to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines to fly from South Dakota to Illinois one-way?

    One-way options have recently been found by users for as low as $89 on Frontier. Other airlines that offer cheap prices include American Airlines from $125 and Delta from $126 one-way.

  • Can I find deals for flights from South Dakota to Illinois that include hotel bookings?

    Yes. In addition to deals on South Dakota to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from South Dakota to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from South Dakota to Illinois.

  • Can I find deals for business class flights from South Dakota to Illinois?

    Yes. Cheapflights offers flight deals from South Dakota to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from South Dakota to Illinois?

    Currently, August is the cheapest month in which you can book a flight from South Dakota to Illinois (average of $245). Flying from South Dakota to Illinois in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for South Dakota to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from South Dakota to Illinois

Discover the top 4 airlines that operate flights from South Dakota to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated julio 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
Denver Air ConnectionCheapest$172Average$198FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$179Average$254FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$193Average$324FlexibilityNo cancel feeOn-time69%
DeltaCheapest$208Average$311FlexibilityNo cancel feeOn-timeN/A

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